Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
You may unsubscribe at any time. Your Privacy Rights | About Us. Fiber needs vary from person to person. But a good target for women is 25 grams per day, while men should aim for 38 grams, says Arthur Beyder, MD, PhD, a gastroenterologist at Mayo Clinic.